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CVE-2026-80665 (GCVE-0-2026-80665)

Vulnerability from cvelistv5 – Published: 2026-08-28 06:49 – Updated: 2026-08-29 06:21
VLAI
Title
KVM: arm64: nv: Inject SEA if kvm_translate_vncr() can't resolve PFN
Summary
In the Linux kernel, the following vulnerability has been resolved: KVM: arm64: nv: Inject SEA if kvm_translate_vncr() can't resolve PFN kvm_handle_vncr_abort() assumes that s1_walk_result conveys an abort when kvm_translate_vncr() returns -EFAULT. This is not always the case as it's possible to encounter 'late' failures on the output of S1 translation, e.g. a GFN outside of the memslots. Fix it by preparing an external abort before returning from kvm_translate_vncr(). Get rid of the BUG_ON() in the fault injection path while at it.
Severity
7.1 (High)
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 2a359e072596fcb2e9e85017a865e3618a2fe5b5 , < 4ead4def04659739c399bfcb063f8a906194c79f (git)
Affected: 2a359e072596fcb2e9e85017a865e3618a2fe5b5 , < 53804b6839573c9c6fff5f4cf075d6746267345e (git)
Affected: 2a359e072596fcb2e9e85017a865e3618a2fe5b5 , < 9f3e83345a56280efffe235c65593c7e544c0fcc (git)
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Linux Linux Affected: 6.16
Unaffected: 0 , < 6.16 (semver)
Unaffected: 6.18.40 , ≤ 6.18.* (semver)
Unaffected: 7.1.5 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "arch/arm64/include/asm/kvm_nested.h",
            "arch/arm64/kvm/at.c",
            "arch/arm64/kvm/nested.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "4ead4def04659739c399bfcb063f8a906194c79f",
              "status": "affected",
              "version": "2a359e072596fcb2e9e85017a865e3618a2fe5b5",
              "versionType": "git"
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              "status": "affected",
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              "versionType": "git"
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            "arch/arm64/kvm/nested.c"
          ],
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          "vendor": "Linux",
          "versions": [
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              "version": "6.16"
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            {
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              "version": "0",
              "versionType": "semver"
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              "versionType": "semver"
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "versionStartIncluding": "6.16",
                  "vulnerable": true
                },
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                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: arm64: nv: Inject SEA if kvm_translate_vncr() can\u0027t resolve PFN\n\nkvm_handle_vncr_abort() assumes that s1_walk_result conveys an abort\nwhen kvm_translate_vncr() returns -EFAULT. This is not always the case\nas it\u0027s possible to encounter \u0027late\u0027 failures on the output of S1\ntranslation, e.g. a GFN outside of the memslots.\n\nFix it by preparing an external abort before returning from\nkvm_translate_vncr(). Get rid of the BUG_ON() in the fault injection\npath while at it."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.1,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The bug is reached only when an arm64 nested-KVM L1 hypervisor triggers VNCR_EL2 data aborts (ESR_ELx_EC_DABT_CUR with ESR_ELx_VNCR) during KVM_RUN via kvm_handle_vncr_abort(); no network, adjacent-radio, or physical-device path reaches this code.\nAC:L - An attacker controlling an L1 nested-hypervisor VM can reliably set VNCR_EL2 and guest EL2 page tables so stage-1 translation succeeds but the resulting GFN is outside host memslots or PFN resolution fails, deterministically hitting the faulty -EFAULT path; nested virt on arm64 cloud hosts is an attacker-selectable deployment.\nPR:N - Exploitation requires no host root or init-namespace capabilities beyond running hypervisor code in a tenant KVM guest on an arm64 host with nested virtualization enabled; the attacker operates entirely from within their assigned VM, consistent with other arm64 KVM nested-virt CVE scoring.\nUI:N - No victim user or administrator action is required beyond the attacker operating their own nested-virtualization workload; VNCR faults, page-table configuration, and repeated translation triggers are fully attacker-driven from within the guest.\nS:C - A malicious nested guest forces host KVM into BUG_ON(!vt-\u003ewr.failed) during VNCR abort handling, crashing the physical host kernel and denying service to all co-resident VMs, crossing the guest-to-hypervisor security boundary beyond the guest\u0027s intended authority.\nC:N - The vulnerability triggers a host kernel BUG_ON panic on a late translation failure without setting s1_walk_result.failed; there is no out-of-bounds read, use-after-free, or other information-disclosure primitive\u2014only an incorrect assumption leading to host crash.\nI:N - Impact is limited to host kernel panic via BUG_ON on the fault-injection path; no guest or host data is modified, no arbitrary write primitive exists, and the fix only prepares an external abort for reinjection to the nested guest.\nA:H - BUG_ON(!vt-\u003ewr.failed) on the late -EFAULT path causes an uncontained host kernel panic on production kernels (CONFIG_BUG=y), crashing the hypervisor and denying availability to every workload on the affected physical machine; the attacker can retrigger after reboot."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-29T06:21:53.024Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/4ead4def04659739c399bfcb063f8a906194c79f"
        },
        {
          "url": "https://git.kernel.org/stable/c/53804b6839573c9c6fff5f4cf075d6746267345e"
        },
        {
          "url": "https://git.kernel.org/stable/c/9f3e83345a56280efffe235c65593c7e544c0fcc"
        }
      ],
      "title": "KVM: arm64: nv: Inject SEA if kvm_translate_vncr() can\u0027t resolve PFN",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-80665",
    "datePublished": "2026-08-28T06:49:08.085Z",
    "dateReserved": "2026-08-26T14:34:25.781Z",
    "dateUpdated": "2026-08-29T06:21:53.024Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-80665",
      "date": "2026-09-15",
      "epss": "0.00156",
      "percentile": "0.05163"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-80665\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-08-28T08:16:51.747\",\"lastModified\":\"2026-08-29T07:16:49.080\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nKVM: arm64: nv: Inject SEA if kvm_translate_vncr() can\u0027t resolve PFN\\n\\nkvm_handle_vncr_abort() assumes that s1_walk_result conveys an abort\\nwhen kvm_translate_vncr() returns -EFAULT. This is not always the case\\nas it\u0027s possible to encounter \u0027late\u0027 failures on the output of S1\\ntranslation, e.g. a GFN outside of the memslots.\\n\\nFix it by preparing an external abort before returning from\\nkvm_translate_vncr(). Get rid of the BUG_ON() in the fault injection\\npath while at it.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"arch/arm64/include/asm/kvm_nested.h\",\"arch/arm64/kvm/at.c\",\"arch/arm64/kvm/nested.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"2a359e072596fcb2e9e85017a865e3618a2fe5b5\",\"lessThan\":\"4ead4def04659739c399bfcb063f8a906194c79f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"2a359e072596fcb2e9e85017a865e3618a2fe5b5\",\"lessThan\":\"53804b6839573c9c6fff5f4cf075d6746267345e\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"2a359e072596fcb2e9e85017a865e3618a2fe5b5\",\"lessThan\":\"9f3e83345a56280efffe235c65593c7e544c0fcc\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"arch/arm64/include/asm/kvm_nested.h\",\"arch/arm64/kvm/at.c\",\"arch/arm64/kvm/nested.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"6.16\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"6.16\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.40\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.5\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H\",\"baseScore\":7.1,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"CHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":2.5,\"impactScore\":4.0}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/4ead4def04659739c399bfcb063f8a906194c79f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/53804b6839573c9c6fff5f4cf075d6746267345e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9f3e83345a56280efffe235c65593c7e544c0fcc\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-31T14:12:54+00:00",
      "cve": "CVE-2026-80665",
      "id": "CVE-2026-80665",
      "initial_release_date": "2026-08-28T00:00:00+00:00",
      "product_status:known_affected": "76",
      "product_status:known_not_affected": "198",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: KVM: arm64: nv: Inject SEA if kvm_translate_vncr() can\u0027t resolve PFN",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80665.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-28T16:34:48Z",
      "cve": "CVE-2026-80665",
      "id": "CVE-2026-80665",
      "initial_release_date": "2026-08-28T16:34:48Z",
      "product_status:known_not_affected": "353",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-80665",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-80665.json",
      "version": "2"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.